Lawn mower grinder



c. ANDERSON LAWN MOWER GRINDER Dec. 16, 1947.

Filed Odt. 2, 1945 3 Sheets-Sheet l r .l F S w x Q m ma N w C. ANDERSON LAWN MOWER GRINDER Dec. 16, 1947.

Filed Oct. 2, 1945 3 Sheets-Sheet 2 Um. 16, 1947. c: ANDERSON LAWN MOWER GRINDER Filed Oct. 2, 1945 3 Sheets-Sheet 3 //V V E N T 01?. EARL ANDERSON B) Y y 5 flzzr-st Patented Dec. 16, 1947 UNITED STATES PATENT OFFICE 2,432,851 LAWN MOWER GRINDER Earl Anderson, Erskine, 1945, Serial No. 619,860

Application October 2,

.6 Claims.

This invention relates to lawn mower sharpening machines.

An object of .thisinventioni is to provide a machine by which the rotary and stationary blades of a lawn mower may be sharpened.

Another object of this invention. is to provide a machine of this kind-which sharpen. lawn mowers of ,diiierentsizes.

A further objector? this invention is to provide In the drawings:

Figure 1 is a plan viewpartly broken away of a lawn mower sharpener constructed according to an embodimentof this invention,

Figure 2 is ,alsectional view taken on the line 2 2 of Figure I,

Figure 3 is a detail sid elevational view of the device, partlybroken awayand in section,

Figure 4 is a sectional view .taken on the line 4- 1 of Figure 1,

Figure 5 is a viewta'ken substantially n the line -5 of Figure '7,

Figure 6 is a view taken on the line '6-5 of'Figure 1,

Figure 7 is a plan view, partlybroken away, of the motor carriage,

Figure 8 is a sectional view taken on line 88 of Figure 1',

Figure 9 isa sectional view taken on the line 9-9 of Figure 1, and

Figure 10 is a fragmentary front elevation of the grinding wheel and reel guide.

Referring to th drawing the numeral l 0-designates generally a frame which comprises a pair of channel-shaped longitudinal bars I I, which track members I'Z'and l3. The inverted V-shaped track members [2 and 1-3 are r the lower 2 or the like to the upper sides of the longitudinal members ll so as to thereby provide V-shaped tracks. The tracks I12 and 13 have slidably mounted thereon a carriage, generally designated as I4. The carriage 1.4 includes a. lower body l5 which is movable length-wise of the tracks .12 and l3 upon rotation of a gear shaft I16 whichis. journalled through an apron or front wall lzT oflthe body I5.

The shaft 16 has secured thereto av ear 1'8 which meshes with an elongated rack l9 which is fixed relative to the rear track. I13. *The'body 15 has extending from the upper side thereof an auxiliary body 20 which is formed with a pair of keyways 2| within which keys 22, carried by side .of an auxiliary carriage 23, are adapted to slidably engage,

The carriage 23 is. movable lengthwise of the guideways 2| by means of a screw shaft 24 engaging adependent nut 2-5 canried by the carriage 23. The carriage '23 is. formed with a longitudinally extending transversely arcuate saddle 2-6 within which an areuate motor support .2?! is adapted to adjustably engage. The motor support 2 includes a table. .28 on which a motor 29 is secured and the motor :29 has-a pulley 30 secured to the shaft thereof, about which a belt 3| engages. 1A grinding wheel shaft 32 is journalled in the bearing 33 secured to the-iorward portion of the motor mounting member 2.1, and a grinding wheel or abrader 34 is secured to theshaft 32. A pulley 35 is securedtothe shaft 32 and the belt 3| is trained thereabout. ,A-brading wheel 34 may be disposed with the axis thereof either horizontal or vertical through the medium of an elongated slot 36 which is formed in the arcuate cradle 27 and through which a screw 3?!" loosely engages. A thumb nut 38 is threaded onto the screw 31 so that the mounting 21 may be ad- The longitudinal frame members H have mounted thereon a pair of parallel guide bars 39 which are secured to thejlongitudinal members H and has a nut 43 threaded on the lower end thereof.

A washer 44 is interposed between the lower side of the guide 39 and an elongated bar 45 is disposed on the lower side of the longitudinal member H, and interposed between the spring washer 36 and the lower side of the frame member A second washer ll is interposed between the lower end of a bolt tensioning spring 13 which engages about the bolt The bar 35 connects the bolts of the two guide members together so that these guide members may be moved as a unit upon rotation of a screw shaft 39 which is journalled lengthwise of the frame member ll. The screw shaft 49 is threaded through a nut 55 fixed to and extending downwardly from the connecting bar 65.

A mower supporting carriage, comprising slide members 5| and 52 engages the guide members 39, and the slide members 5| and 52 are connected together by means of an elongated connecting bar 53 which is formed of a pair of elongated slots 54 and 55 adjacent the ends thereof through which thumb screws 56 and 51 engage.

The slide members 5| and 52 are of like construction and are shown more clearly in Figure 3 and each includes an elongated bar 58 which is formed with a pair of split rings 59 at the opposite ends thereof forming clamping rings which are tightened about the guide members 39 by clamp bolts 60.

The mower is firmly clamped on the carriage formed by the bars 5| and 52 by means of a clamping structure which includes a lower arcuate stationary jaw 6| fixed to the upper side of each slide bar 5| and 52.

A vertically disposed threaded shaft 62 is extended through the central portions of the slide bar 5| being locked in vertically adjusted position by means of a lock nut 63 and a thumb nut 65. The shaft 52 includes a rectangular frame 55 which is disposed in a position for receiving the stationary stub shaft 66 which is carried by the side frame 61 of the mower.

The upper downwardly urged clamping member 68 slidably engages on the shaft 62, and is clamped against the upper side of the side members 61 of the mower by means of a nut 69 threaded on the shaft 62 and which has a crank 13 secured thereto.

In order to provide a means whereby the stationary cutter blade 1| of the mower may be sharpened when the stationary blade is removed from the mower frame I have provided a pair of confronting cone-shaped clamping members 12 which are carried by threaded shaft 13 engaging through vertically adjustable nuts 14 which are fixed to the upper ends of threaded rods 18 loosely engaging through lugs 19 carried by carriage bars 5| and 52 and locked in vertically adjusted position by nuts 80.

The center points 12 engage in center openings which are usually formed in the stud shafts carried by the stationary blades 1|, and each screw shaft 13 has a crank secured thereto. The rear or back side of the blade 1| is clamped by means of a substantially U-shaped clamp 16 which is carried by a supporting bar 8|. A threaded shaft 11 engages through the upper jaw of the clamp 16 and is threaded into the lower jaw. A crank or handle 18 is secured to the draft 11 so that this shaft may be readily rotated either to clamping or released position. The supporting bar is angularly carried by the upper end of a vertically adjusted threaded rod 32 engaging through bar 53 and locked in adjusted position by nuts 83.

In the use and operation of this device the motor 29 is connected to a source of electric power and the lawn mower has the wheels removed therefrom, and the handle disengaged from the frame so that the end plates of the mower may be clamped between the clamping jaws BI and 68. The rotary blade or reel is then engaged by the abrading wheel 31, which may be disposed in the position shown in Figure 1. The blade being ground is disposed between the confronting ends of a pair of arcuate guide arms 84 which are adjustably carried by a rod 85 which is fixed relative to the cradle 21.

The guide members 39 are adjusted toward or away from the abrading wheel 39 by rotation of the screw shafts 49 which have hand wheels 19 secured to the rear ends thereof.

In the event it is desired to grind the upper surface of the stationary blade 1|, this blade may be removed from the mower frame, and clamped between the points 12 with the back of the blade 1| clamped between the clamp 16.

The abrading wheel 34 may be turned with the motor 29 to position the axis thereof vertically so that the flat side of the abrader will engage the upper surface of the blade 1 What I claim is:

1. A lawn mower sharpener comprising a bed formed of a pair of elongated channel members, a pair of guide rails secured between said channel members, a carriage movable on said rails, a saddle carried by said carriage having a horizontally disposed concave upper side, a cradle on said saddle, a motor on said cradle, an abrading wheel on said cradle connected to said motor, means for adjusting said cradle on said saddle whereby to vary the cutting angle of said abrading wheel, means supporting the mower in a position for contact with the abrading wheel.

2. A lawn mower sharpener, as set forth in claim 1, wherein said supporting means includes a carriage movably mounted on said channel members, and means adjusting the position of said latter carriage relative to said first carriage.

3. A lawn mower sharpener as set forth in claim 1, including a pair of arcuate guide arms carried by said cradle and engaging about said abrading wheel and having their free ends spaced apart for slidably receiving therebetween a reel blade.

4. A lawn mower sharpener comprising a bed formed of longitudinal channel members, a pair of transverse guide rails fixed to said members, a

main carriage slidable on said rails, a second carriage slidably carried by said main carriage, an abrading member rotatably carried by said second carriage, a mower supporting carriage adjustably carried by said channel members, means adjusting said mower carriage toward or from said second carriage, and means securing a mower on said mower carriage, said second carriage including an arcuate saddle having a horizontally disposed concave upper side, a cradle in said saddle, means supporting said abrading member on said cradle, a power member on said cradle connected to said abrading member, and means rotatably adjusting the position of said cradle to thereby vary the angular position of said abrading member.

5. A lawn mower sharpener comprising a bed formed of longitudinal channel members, a pair of transverse guide rails fixed to said members, a main carriage slidable on said rails, a second carriage slidably carried by said main carriage, an abrading member rotatably carried by said second carriage, a mower supporting carriage adjustably carried by said channel members, means adjusting said mower carriagetoward or from said second carriage, and means securing a mower on said mower carriage, said mower carriage including a pair of parallel elongated guide bars, means disposed within the channels of said members connecting said guide bars together, a nut 6. A lawn mower sharpener comprising a bed formed of a pair of horizontally disposed parallel channel members, a pair of horizontally disposed parallel guide rails fixed between said channel members, a main carriage slidable on said rails, means adjusting said main carriagealong said rails, a second carriage slidable on said main carriage in a direction parallel to said channel members, an abrading member, means for rotating said abrading member, a common supporting means for said abrading member and said rotating means, means mounting said supporting means on said second carriage whereby said supporting means may be rotatably adjusted about a horizontal axis parallel to said channel members, a mower carriage disposed in confronting position to said main carriage, and means supporting said mower carriage between said channel members.

CARL ANDERSON.

REFERENCES CITED The following references are of record in the fiie of this patent:

UNITED STATES PATENTS Number Name Date 850,374 King Apr. 16, 1907 1,344,168 Brown June 22, 1920 1,836,482 Lyon et a1 Dec. 15, 1931 20 1,967,964 Miller July 24, 1934 2,180,911 Rogers Nov. 21, 1939 2,377,126 Brown May 29, 1945 

